288 



TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



1914. 



Double 



Average 



Diatoms. 



Dinoflag- 



Copepoda. 



Copepod. 





hauls. 



catch. 





ellates. 





nauplii. 



January ... 



8 



c.c. 

 2-5 



29,725 



2,179 



4,923 



1,524 



February... 



7 



3-2 



70,486 



1,973 



7,032 



3,380 



March 



8 



6-5 



759,072 



5,701 



7,276 



7,385 



April 



9 



34-7 



3,257,761 



15,278 



26,121 



66,601 



May 



8 



34-8 



22,370,831 



37,365 



12,042 



40,920 



June 



9 



24-5 



2,364,992 



13,911 



27,281 



43,978 



July 



9 



12-7 



1,259,516 



5,654 



40,949 



44,089 



August . . . 



9 



10-8 



380 



2,443 



37,889 



52,372 



September 



8 



12-7 



206,177 



1,375 



69,702 



32,711 



October ... 



9 



11-3 



908,827 



20,658 



27,411 



51,022 



November 



6 



7-9 



569,727 



22,503 



54,549 



18,905 



December 



7 



3-7 



77,220 



16,343 



18,546 



6,984 



Erom this table we see that the spring maximum 

 was again in May, agreeing in this respect with that of 

 1911 and of 1913 — though really earlier in the month 

 than in the latter year. The actual largest haul was 

 88*5 c.c. on May 4th. On the whole, the curve of the 

 monthly averages of the total catch agrees fairly well 

 with that for 1913, but while the averages for May, 

 June, and July are lower, those from August to the end 

 of the year are higher. We noticed last year (1913) that 

 the autumn maximum was an unusually low one; this 

 year it is somewhat higher, but not so high as we have 

 sometimes recorded. 



It will be noticed from the table that although the 

 Copepoda, as usual, attain their highest numbers much 

 later in the year than the Diatom maximum, the 

 Dinoflagellates this year attain to their maximum in the 

 same month, May, with the Diatoms. Last year (1913) 

 the Dinonagellate maximum — a much greater one than 

 this year — was as late as July. "We consider that, 

 however, to be unusually late. 



We have drawn curves for these various groups in 

 the two years, but consider it unnecessary to reproduce 

 them, as the changes from month to month can be readily 



